25. Actual Soviet Massed Attacks Were Rare
There are a few documented cases of mass attacks by Soviet forces during WWII. However, far from being terrifying human waves that overwhelmed German divisions with bodies until they ran out of bullets’, they consisted of encircled Soviet troops desperately attempting to break out. Either that, or local militia with no military training and thus not knowing any better, trying to slow down the Germans.
The actual Soviet offensive operations that shattered German defenses were modern combined arms attacks, executed with integrated infantry, artillery, and armor. They did attempt to concentrate troops for the maximum superiority of numbers possible at the key point. However, nothing about that was unique to the Soviets. Concentration of forces to achieve maximum local superiority at the decisive point is what all armies aim for when attacking.